Creating and appending to an array, mapfile vs arr+=(input) same thing or am I missing something?

Is there a case where mapfile has benefits over arr+=(input)? ## Simple examples ### mapfile array name, arr:

mkdir {1,2,3}

mapfile -t arr < <(ls)

declare -p arr

### output:

declare -a arr=()="1" ="2" ="3")

Edit: changed title for below; the body had y as the array name, but the title had arr as the name, which this could lead to confusion. ## y+=(input)

IFS=$'\n'

y+=($(ls))

declare -p y

### output:

declare -a y=()="1" ="2" ="3")

--- An advantage to mapfile is you don't have to worry about word splitting I think. For the other way you can avoid word splitting by setting IFS=$'\n' although for this example it's nothing to worry about. The second example just seems easier to write, anything I'm missing out on?